(x³-a)³-a²=0RT.

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(x³-a)³-a²=0RT.
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(x³-a)³-a²=0RT.
(x³-a)³-a²=0
RT.

(x³-a)³-a²=0RT.
x^3-a=a^(2/3)
x^3=a^(2/3)+a
x=[a^(2/3)+a]^(1/3)